Ive had 8 different units of these over the last 3 years fail with the usual sticky pistons in the master cylinder, usually takes 2 weeks to 7 weeks to get them back from Sram (so called) tech centre via my LBS, had them all R, RS, RSC, etc,
The latest RE 2020 brakes are no different, had my Specilaised 6 weeks, and they are at it again, ffs SRAM what are they doing, time they took their head out of the sand or other oriface, and get this sorted, quality control is zero, pathetic, and they should be avoided at all costs.
Managed to get piston re build kits if its any help from SLAM69 in Gloucester, Graham has them in stock, £10 each, and was great on service.
Back to shimano 4 good !